Derrick



P. E. PETERSEN.

DERRICK. APPLICATION FILED NOV. 1'3. 1920.

Patented 0013.111922] 2 SHEETSSHEET 1'.

P. E. PETERSEN.

DERRICK.

APPLICATION FILED NOV. 13, 1920.

1,432,726. Patented 0ct.17,1922.

2 SHEETS-SHEET 2.

Patented Qer. 17, 1922.

tra

PHEE EDWARD PETERSEN, 0F SEATTLE, WASHINGTON.

DERRICK.

Application filed November 13, 1920. Serial at. 423,977.

and useful Improvementsin a Derrick, of 'wlnch the following is a specification.

This invention relates to movable derricks mounted upon wheeled supports, or trucks, and has for one of its objects to simplify and improve the construction and increase the efficiency and utility of devices of this character.

Another object of the invention is to provide a device of this character having means whereby the foot or base portion of the hoisting boom may be engaged with the ground over which the truck or body is moved. v I

With these and other objects in view, the invention consists in certain novel features of construction as hereinafter shown and described and then specifically pointed out in the claims, and in the drawings illustrative of the preferred embodiment of the invention.

Figure 1 is a side elevation,

' Fig. 2 is a front elevation,

Fig. 3 is an enlarged detail of the swivel mast coupling, and,

Fig. dis an enlarged sectional detail of the foot member of the mast.

The improved apparatus is mounted on a wheeled vehicle of suitable construction. preferably of the -motor driven class, and includes a platform 10 suported on traction wheels 11. The platform 10 is provided with a rearwardly opening recess 12, and mounted on the platform, at its rear, are standards comprising side members or beams 13. connected at their upper-ends to a socket device 14. The beam members 13 are outturned at 1 their lower ends to form attaching feet 15,

18, is a clip, device or strap 20, and slidable by which the beams are connected to the platform by bolts or like devices.

The beams are thus located at opposite sides of the recess 12 and are further supported by suitable braces 16 from the platform.

Mounted for rotation in the socket 14 is a stud or pin 17, the latter having a perforated ear 18, and pivoted at 19 to the ear through the clip is a boom or mast element 21. By this arrangement the boom or mast 21 is free to swing both laterally and vertically and also free to slide lon; 2;itudinally relative to the strap or clip device 20, so that itcan be disposed in a substantially vertical or backwardly leaning position with the lower part extending through the recess 12 of the platform as shown in full lines -in Fig. 1 when in use.

The boom or mast 21 is generally of wood but-may be of piping, if preferred, and at its lower end is provided with a ferrule or cap 22 to receive a relatively heavy screw 23. The screw is rotatively coupled at 24c to a support 25, and rotatively coupled at 26 to the support is a ground bearing base element 27, the latter preferably provided with ground engaging claws 28.

By this means the base member will engage the ground flatly no matter what inclination may be imparted to the mast or boom, and by rotating the screw 28 by a lever applied to its turning head, the boom may be anchored to the ground, and its steadiness and stability thus insured.

If found necessary additional brace rods may be employed.

At its upper end the boom or mast is provided with a strap or clip 29 to receive the upper block or sheave of a hoisting appliance represented as a whole at 30.

Suitable pull cables 81 and tackle elements 32 are also applied to the boom to actuate the same in disposing it in operative or inoperative position.

The improved device is simple in construction, can be inexpensively manufactured, and will be found very useful under many circumstances.

The device will be found particularly useful in erecting telegraph poles, smoke stacks and in handling small wrecks especially in connection with street railways, where the overhead trolley system is employed, as the boom or mastcan be quickly lowered to enable the apparatus to pass under the trolley wires and then elevated and disposed in operative position when the 10- cality where the derrick is to be operated is reached.

The preferred embodiment of the invention is disclosed in the drawings and set forth in. the specification, but it will be understood that any modifications within the scope of the claims may be made in the construction without departing from the principle of the invention or sacrificing any of its advantages.

lines in Fig. 1, the hoisting appliance 30 5 will preferably be coupled by; the hook member 32 of its lower pulley block member, to

some portion of the device, as indicated b'ydotted lines in Fig. 1, for instance to an eye bolt near the band 22, to hold it temporarily and prevent it swinging aboutwhilethe apparatus is being transported.

I claim:

1. In anapparatus of the classdescribed, a Wheel supported body including a platform having a rearwardly opening recess, a standard supported by said platform, a swivel devicerotative.relative to said standard, a clip device swinging relativeto said h reto.

the: body is ;s;up ported.

2. In an apparatus of the class described,

avheel supported body including a platform, a standardsupported by said platii'orm and carrying asocket, a swivel device rotative in said socket and. having a per fo ated ear, a cl p device sivlnging upon said ear and a boom "(161 1.66 slidable through sald clip device, whereby the boom may bedisposed, with its lower end 1 engaging the grounol on Whiehthebody is supported In testimony whereof l afiix my signature ,PHEELEDWARDPETERSEN. 

